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PCF85363ATL/A 数据表(PDF) 51 Page - NXP Semiconductors |
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PCF85363ATL/A 数据表(HTML) 51 Page - NXP Semiconductors |
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51 / 86 page  NXP Semiconductors PCF85363A Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input, and I2C-bus COF[2:0] Frequency (Hz) Typical duty cycle[1] 000[2] 32 768 60 : 40 to 40 : 60 001 16 384 50 : 50 010 8 192 50 : 50 011 4 096 50 : 50 100 2 048 50 : 50 101 1 024 50 : 50 110 1[3] 50 : 50 111 static - Table 58. Clock duty cycles [1] Duty cycle definition: % HIGH-level time : % LOW-level time. [2] Default values. The duty cycle of the CLKOUT when outputting 32,768 Hz could change from 60:40 to 40:60 depending on the detector since the 32,768 Hz is derived from the oscillator output which is not perfect. It could change from device to device and it depends on the silicon diffusion. There is nothing that can be done from outside the chip to influence the duty cycle. [3] 1 Hz clock pulses are not affected by offset correction pulses. 7.14 Flags register Bit Symbol Flag name Value Description read: periodic interrupt flag inactive 0[1] write: periodic interrupt flag is cleared read: periodic interrupt flag active 7 PIF Periodic Interrupt Flag Section 7.13.2 1 write: periodic interrupt flag remains unchanged read: alarm2 flag inactive 0[1] write: alarm2 flag is cleared read: alarm2 flag active 6 A2F Alarm2 Flag Section 7.4 1 write: alarm2 flag remains unchanged read: alarm1 flag inactive 0[1] write: alarm1 flag is cleared read: alarm1 flag active 5 A1F Alarm1 Flag Section 7.4 1 write: alarm1 flag remains unchanged read: WatchDog flag inactive 0[1] write: WatchDog flag is cleared read: WatchDog flag active 4 WDF WatchDog Flag Section 7.5 1 write: WatchDog flag remains unchanged read: battery switch flag inactive 0[1] write: battery switch flag is cleared read: battery switch flag active 3 BSF Battery Switch Flag Section 7.11 1 write: battery switch flag remains unchanged Table 59. Flags - Flag status register (address 2Bh) bit description PCF85363A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 3.1 — 18 June 2021 51 / 86 |
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